R 画地图

R 绘制中国省市分布地图

library(maps)
library(mapdata)
library(maptools);

getColor=function(mapdata,provname,provcol,othercol)
{
  f=function(x,y) ifelse(x %in% y,which(y==x),0);
  colIndex=sapply(mapdata@data$NAME,f,provname);
  fg=c(othercol,provcol)[colIndex+1];
  return(fg);
}

# 参考例子 http://cos.name/2009/07/drawing-china-map-using-r/
# 地图数据下载 http://cos.name/wp-content/uploads/2009/07/chinaprovinceborderdata_tar_gz.zip
x = readShapePoly('bou2_4p.shp');

provname=c("北京市","天津市","河北省","山西省","内蒙古自治区",
           "辽宁省","吉林省","黑龙江省","上海市","江苏省",
           "浙江省","安徽省","福建省","江西省","山东省",
           "河南省","湖北省","湖南省","广东省",
           "广西壮族自治区","海南省","重庆市","四川省","贵州省",
           "云南省","西藏自治区","陕西省","甘肃省","青海省",
           "宁夏回族自治区","新疆维吾尔自治区","台湾省",
           "香港特别行政区");
pop=c(1633,1115,6943,3393,2405,4298,2730,3824,1858,7625,
      5060,6118,3581,4368,9367,9360,5699,6355,9449,
      4768,845,2816,8127,3762,4514,284,3748,2617,
      552,610,2095,2296,693);

provcol=rgb(red=1-pop/max(pop)/2,green=1-pop/max(pop)/2,blue=1);
plot(x,col=getColor(x,provname,provcol,"white"),xlab="",ylab="");